<va-form style="width: 300px;">
  <va-input
    label="First Name"
    :model-value="''"
    :rules="[value => (value && value.length > 0) || 'Field is required']"
  ></va-input>
  <va-input
    class="mt-3"
    label="Last Name"
    :model-value="''"
    :rules="[value => (value && value.length > 0) || 'Field is required']"
  ></va-input>
</va-form>